<?php

////////////////////////////////////////////////////
// SMTP - PHP SMTP class
//
// Version 1.02
//
// Define an SMTP class that can be used to connect
// and communicate with any SMTP server. It implements
// all the SMTP functions defined in RFC821 except TURN.
//
// Author: Chris Ryan
//
// License: LGPL, see LICENSE
////////////////////////////////////////////////////

/**
 * SMTP is rfc 821 compliant and implements all the rfc 821 SMTP
 * commands except TURN which will always return a not implemented
 * error. SMTP also provides some utility methods for sending mail
 * to an SMTP server.
 * @package PHPMailer
 * @author Chris Ryan
 */

class SMTP {
   /**
    *  SMTP server port
    *  @var int
    */
   var $SMTP_PORT = 25;

   /**
    *  SMTP reply line ending
    *  @var string
    */
   var $CRLF = "\r\n";

   /**
    *  Sets whether debugging is turned on
    *  @var bool
    */
   var $do_debug;       # the level of debug to perform

   /**#@+
    * @access private
    */
   var $smtp_conn;      # the socket to the server
   var $error;          # error if any on the last call
   var $helo_rply;      # the reply the server sent to us for HELO
   /**#@-*/

   /**
    * Initialize the class so that the data is in a known state.
    * @access public
    * @return void
    */
   function SMTP() {
      $this->smtp_conn = 0;
      $this->error = null;
      $this->helo_rply = null;

      $this->do_debug = 0;
   }

   /*************************************************************
    *                    CONNECTION FUNCTIONS                  *
    ***********************************************************/

   /**
    * Connect to the server specified on the port specified.
    * If the port is not specified use the default SMTP_PORT.
    * If tval is specified then a connection will try and be
    * established with the server for that number of seconds.
    * If tval is not specified the default is 30 seconds to
    * try on the connection.
    *
    * SMTP CODE SUCCESS: 220
    * SMTP CODE FAILURE: 421
    * @access public
    * @return bool
    */
   function Connect($host,$port=0,$tval=30) {
      # set the error val to null so there is no confusion
      $this->error = null;

      # make sure we are __not__ connected
      if($this->connected()) {
	 # ok we are connected! what should we do?
	 # for now we will just give an error saying we
	 # are already connected
	 $this->error =
	    array("error" => "Already connected to a server");
	 return false;
      }

      if(empty($port)) {
	 $port = $this->SMTP_PORT;
      }

      #connect to the smtp server
      $this->smtp_conn = fsockopen($host,    # the host of the server
	 $port,    # the port to use
	 $errno,   # error number if any
	 $errstr,  # error message if any
	 $tval);   # give up after ? secs
      # verify we connected properly
      if(empty($this->smtp_conn)) {
	 $this->error = array("error" => "Failed to connect to server",
	    "errno" => $errno,
	    "errstr" => $errstr);
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": $errstr ($errno)" . $this->CRLF;
	 }
	 return false;
      }

      # sometimes the SMTP server takes a little longer to respond
      # so we will give it a longer timeout for the first read
      // Windows still does not have support for this timeout function
      if(substr(PHP_OS, 0, 3) != "WIN")
	 socket_set_timeout($this->smtp_conn, $tval, 0);

      # get any announcement stuff
      $announce = $this->get_lines();

      # set the timeout  of any socket functions at 1/10 of a second
      //if(function_exists("socket_set_timeout"))
      //   socket_set_timeout($this->smtp_conn, 0, 100000);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $announce;
      }

      return true;
   }

   /**
    * Performs SMTP authentication.  Must be run after running the
    * Hello() method.  Returns true if successfully authenticated.
    * @access public
    * @return bool
    */
   function Authenticate($username, $password) {
      // Start authentication
      fputs($this->smtp_conn,"AUTH LOGIN" . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($code != 334) {
	 $this->error =
	    array("error" => "AUTH not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }

      // Send encoded username
      fputs($this->smtp_conn, base64_encode($username) . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($code != 334) {
	 $this->error =
	    array("error" => "Username not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }

      // Send encoded password
      fputs($this->smtp_conn, base64_encode($password) . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($code != 235) {
	 $this->error =
	    array("error" => "Password not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }

      return true;
   }

   /**
    * Returns true if connected to a server otherwise false
    * @access private
    * @return bool
    */
   function Connected() {
      if(!empty($this->smtp_conn)) {
	 $sock_status = socket_get_status($this->smtp_conn);
	 if($sock_status["eof"]) {
	    # hmm this is an odd situation... the socket is
	    # valid but we aren't connected anymore
	    if($this->do_debug >= 1) {
	       echo "SMTP -> NOTICE:" . $this->CRLF .
		  "EOF caught while checking if connected";
	    }
	    $this->Close();
	    return false;
	 }
	 return true; # everything looks good
      }
      return false;
   }

   /**
    * Closes the socket and cleans up the state of the class.
    * It is not considered good to use this function without
    * first trying to use QUIT.
    * @access public
    * @return void
    */
   function Close() {
      $this->error = null; # so there is no confusion
      $this->helo_rply = null;
      if(!empty($this->smtp_conn)) {
	 # close the connection and cleanup
	 fclose($this->smtp_conn);
	 $this->smtp_conn = 0;
      }
   }


   /***************************************************************
    *                        SMTP COMMANDS                       *
    *************************************************************/

   /**
    * Issues a data command and sends the msg_data to the server
    * finializing the mail transaction. $msg_data is the message
    * that is to be send with the headers. Each header needs to be
    * on a single line followed by a <CRLF> with the message headers
    * and the message body being seperated by and additional <CRLF>.
    *
    * Implements rfc 821: DATA <CRLF>
    *
    * SMTP CODE INTERMEDIATE: 354
    *     [data]
    *     <CRLF>.<CRLF>
    *     SMTP CODE SUCCESS: 250
    *     SMTP CODE FAILURE: 552,554,451,452
    * SMTP CODE FAILURE: 451,554
    * SMTP CODE ERROR  : 500,501,503,421
    * @access public
    * @return bool
    */
   function Data($msg_data) {
      $this->error = null; # so no confusion is caused

      if(!$this->connected()) {
	 $this->error = array(
	    "error" => "Called Data() without being connected");
	 return false;
      }

      fputs($this->smtp_conn,"DATA" . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
      }

      if($code != 354) {
	 $this->error =
	    array("error" => "DATA command not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }

      # the server is ready to accept data!
      # according to rfc 821 we should not send more than 1000
      # including the CRLF
      # characters on a single line so we will break the data up
      # into lines by \r and/or \n then if needed we will break
      # each of those into smaller lines to fit within the limit.
      # in addition we will be looking for lines that start with
      # a period '.' and append and additional period '.' to that
      # line. NOTE: this does not count towards are limit.

      # normalize the line breaks so we know the explode works
      $msg_data = str_replace("\r\n","\n",$msg_data);
      $msg_data = str_replace("\r","\n",$msg_data);
      $lines = explode("\n",$msg_data);

      # we need to find a good way to determine is headers are
      # in the msg_data or if it is a straight msg body
      # currently I'm assuming rfc 822 definitions of msg headers
      # and if the first field of the first line (':' sperated)
      # does not contain a space then it _should_ be a header
      # and we can process all lines before a blank "" line as
      # headers.
      $field = substr($lines[0],0,strpos($lines[0],":"));
      $in_headers = false;
      if(!empty($field) && !strstr($field," ")) {
	 $in_headers = true;
      }

      $max_line_length = 998; # used below; set here for ease in change

      while(list(,$line) = @each($lines)) {
	 $lines_out = null;
	 if($line == "" && $in_headers) {
	    $in_headers = false;
	 }
	 # ok we need to break this line up into several
	 # smaller lines
	 while(strlen($line) > $max_line_length) {
	    $pos = strrpos(substr($line,0,$max_line_length)," ");

	    # Patch to fix DOS attack
	    if(!$pos) {
	       $pos = $max_line_length - 1;
	    }

	    $lines_out[] = substr($line,0,$pos);
	    $line = substr($line,$pos + 1);
	    # if we are processing headers we need to
	    # add a LWSP-char to the front of the new line
	    # rfc 822 on long msg headers
	    if($in_headers) {
	       $line = "\t" . $line;
	    }
	 }
	 $lines_out[] = $line;

	 # now send the lines to the server
	 while(list(,$line_out) = @each($lines_out)) {
	    if(strlen($line_out) > 0)
	    {
	       if(substr($line_out, 0, 1) == ".") {
		  $line_out = "." . $line_out;
	       }
	    }
	    fputs($this->smtp_conn,$line_out . $this->CRLF);
	 }
      }

      # ok all the message data has been sent so lets get this
      # over with aleady
      fputs($this->smtp_conn, $this->CRLF . "." . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
      }

      if($code != 250) {
	 $this->error =
	    array("error" => "DATA not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }
      return true;
   }

   /**
    * Expand takes the name and asks the server to list all the
    * people who are members of the _list_. Expand will return
    * back and array of the result or false if an error occurs.
    * Each value in the array returned has the format of:
    *     [ <full-name> <sp> ] <path>
    * The definition of <path> is defined in rfc 821
    *
    * Implements rfc 821: EXPN <SP> <string> <CRLF>
    *
    * SMTP CODE SUCCESS: 250
    * SMTP CODE FAILURE: 550
    * SMTP CODE ERROR  : 500,501,502,504,421
    * @access public
    * @return string array
    */
   function Expand($name) {
      $this->error = null; # so no confusion is caused

      if(!$this->connected()) {
	 $this->error = array(
	    "error" => "Called Expand() without being connected");
	 return false;
      }

      fputs($this->smtp_conn,"EXPN " . $name . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
      }

      if($code != 250) {
	 $this->error =
	    array("error" => "EXPN not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }

      # parse the reply and place in our array to return to user
      $entries = explode($this->CRLF,$rply);
      while(list(,$l) = @each($entries)) {
	 $list[] = substr($l,4);
      }

      return $list;
   }

   /**
    * Sends the HELO command to the smtp server.
    * This makes sure that we and the server are in
    * the same known state.
    *
    * Implements from rfc 821: HELO <SP> <domain> <CRLF>
    *
    * SMTP CODE SUCCESS: 250
    * SMTP CODE ERROR  : 500, 501, 504, 421
    * @access public
    * @return bool
    */
   function Hello($host="") {
      $this->error = null; # so no confusion is caused

      if(!$this->connected()) {
	 $this->error = array(
	    "error" => "Called Hello() without being connected");
	 return false;
      }

      # if a hostname for the HELO wasn't specified determine
      # a suitable one to send
      if(empty($host)) {
	 # we need to determine some sort of appopiate default
	 # to send to the server
	 $host = "localhost";
      }

      // Send extended hello first (RFC 2821)
      if(!$this->SendHello("EHLO", $host))
      {
	 if(!$this->SendHello("HELO", $host))
	    return false;
      }

      return true;
   }

   /**
    * Sends a HELO/EHLO command.
    * @access private
    * @return bool
    */
   function SendHello($hello, $host) {
      fputs($this->smtp_conn, $hello . " " . $host . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER: " . $this->CRLF . $rply;
      }

      if($code != 250) {
	 $this->error =
	    array("error" => $hello . " not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }

      $this->helo_rply = $rply;

      return true;
   }

   /**
    * Gets help information on the keyword specified. If the keyword
    * is not specified then returns generic help, ussually contianing
    * A list of keywords that help is available on. This function
    * returns the results back to the user. It is up to the user to
    * handle the returned data. If an error occurs then false is
    * returned with $this->error set appropiately.
    *
    * Implements rfc 821: HELP [ <SP> <string> ] <CRLF>
    *
    * SMTP CODE SUCCESS: 211,214
    * SMTP CODE ERROR  : 500,501,502,504,421
    * @access public
    * @return string
    */
   function Help($keyword="") {
      $this->error = null; # to avoid confusion

      if(!$this->connected()) {
	 $this->error = array(
	    "error" => "Called Help() without being connected");
	 return false;
      }

      $extra = "";
      if(!empty($keyword)) {
	 $extra = " " . $keyword;
      }

      fputs($this->smtp_conn,"HELP" . $extra . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
      }

      if($code != 211 && $code != 214) {
	 $this->error =
	    array("error" => "HELP not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }

      return $rply;
   }

   /**
    * Starts a mail transaction from the email address specified in
    * $from. Returns true if successful or false otherwise. If True
    * the mail transaction is started and then one or more Recipient
    * commands may be called followed by a Data command.
    *
    * Implements rfc 821: MAIL <SP> FROM:<reverse-path> <CRLF>
    *
    * SMTP CODE SUCCESS: 250
    * SMTP CODE SUCCESS: 552,451,452
    * SMTP CODE SUCCESS: 500,501,421
    * @access public
    * @return bool
    */
   function Mail($from) {
      $this->error = null; # so no confusion is caused

      if(!$this->connected()) {
	 $this->error = array(
	    "error" => "Called Mail() without being connected");
	 return false;
      }

      fputs($this->smtp_conn,"MAIL FROM:<" . $from . ">" . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
      }

      if($code != 250) {
	 $this->error =
	    array("error" => "MAIL not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }
      return true;
   }

   /**
    * Sends the command NOOP to the SMTP server.
    *
    * Implements from rfc 821: NOOP <CRLF>
    *
    * SMTP CODE SUCCESS: 250
    * SMTP CODE ERROR  : 500, 421
    * @access public
    * @return bool
    */
   function Noop() {
      $this->error = null; # so no confusion is caused

      if(!$this->connected()) {
	 $this->error = array(
	    "error" => "Called Noop() without being connected");
	 return false;
      }

      fputs($this->smtp_conn,"NOOP" . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
      }

      if($code != 250) {
	 $this->error =
	    array("error" => "NOOP not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }
      return true;
   }

   /**
    * Sends the quit command to the server and then closes the socket
    * if there is no error or the $close_on_error argument is true.
    *
    * Implements from rfc 821: QUIT <CRLF>
    *
    * SMTP CODE SUCCESS: 221
    * SMTP CODE ERROR  : 500
    * @access public
    * @return bool
    */
   function Quit($close_on_error=true) {
      $this->error = null; # so there is no confusion

      if(!$this->connected()) {
	 $this->error = array(
	    "error" => "Called Quit() without being connected");
	 return false;
      }

      # send the quit command to the server
      fputs($this->smtp_conn,"quit" . $this->CRLF);

      # get any good-bye messages
      $byemsg = $this->get_lines();

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $byemsg;
      }

      $rval = true;
      $e = null;

      $code = substr($byemsg,0,3);
      if($code != 221) {
	 # use e as a tmp var cause Close will overwrite $this->error
	 $e = array("error" => "SMTP server rejected quit command",
	    "smtp_code" => $code,
	    "smtp_rply" => substr($byemsg,4));
	 $rval = false;
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $e["error"] . ": " .
	       $byemsg . $this->CRLF;
	 }
      }

      if(empty($e) || $close_on_error) {
	 $this->Close();
      }

      return $rval;
   }

   /**
    * Sends the command RCPT to the SMTP server with the TO: argument of $to.
    * Returns true if the recipient was accepted false if it was rejected.
    *
    * Implements from rfc 821: RCPT <SP> TO:<forward-path> <CRLF>
    *
    * SMTP CODE SUCCESS: 250,251
    * SMTP CODE FAILURE: 550,551,552,553,450,451,452
    * SMTP CODE ERROR  : 500,501,503,421
    * @access public
    * @return bool
    */
   function Recipient($to) {
      $this->error = null; # so no confusion is caused

      if(!$this->connected()) {
	 $this->error = array(
	    "error" => "Called Recipient() without being connected");
	 return false;
      }

      fputs($this->smtp_conn,"RCPT TO:<" . $to . ">" . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
      }

      if($code != 250 && $code != 251) {
	 $this->error =
	    array("error" => "RCPT not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }
      return true;
   }

   /**
    * Sends the RSET command to abort and transaction that is
    * currently in progress. Returns true if successful false
    * otherwise.
    *
    * Implements rfc 821: RSET <CRLF>
    *
    * SMTP CODE SUCCESS: 250
    * SMTP CODE ERROR  : 500,501,504,421
    * @access public
    * @return bool
    */
   function Reset() {
      $this->error = null; # so no confusion is caused

      if(!$this->connected()) {
	 $this->error = array(
	    "error" => "Called Reset() without being connected");
	 return false;
      }

      fputs($this->smtp_conn,"RSET" . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
      }

      if($code != 250) {
	 $this->error =
	    array("error" => "RSET failed",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }

      return true;
   }

   /**
    * Starts a mail transaction from the email address specified in
    * $from. Returns true if successful or false otherwise. If True
    * the mail transaction is started and then one or more Recipient
    * commands may be called followed by a Data command. This command
    * will send the message to the users terminal if they are logged
    * in.
    *
    * Implements rfc 821: SEND <SP> FROM:<reverse-path> <CRLF>
    *
    * SMTP CODE SUCCESS: 250
    * SMTP CODE SUCCESS: 552,451,452
    * SMTP CODE SUCCESS: 500,501,502,421
    * @access public
    * @return bool
    */
   function Send($from) {
      $this->error = null; # so no confusion is caused

      if(!$this->connected()) {
	 $this->error = array(
	    "error" => "Called Send() without being connected");
	 return false;
      }

      fputs($this->smtp_conn,"SEND FROM:" . $from . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
      }

      if($code != 250) {
	 $this->error =
	    array("error" => "SEND not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }
      return true;
   }

   /**
    * Starts a mail transaction from the email address specified in
    * $from. Returns true if successful or false otherwise. If True
    * the mail transaction is started and then one or more Recipient
    * commands may be called followed by a Data command. This command
    * will send the message to the users terminal if they are logged
    * in and send them an email.
    *
    * Implements rfc 821: SAML <SP> FROM:<reverse-path> <CRLF>
    *
    * SMTP CODE SUCCESS: 250
    * SMTP CODE SUCCESS: 552,451,452
    * SMTP CODE SUCCESS: 500,501,502,421
    * @access public
    * @return bool
    */
   function SendAndMail($from) {
      $this->error = null; # so no confusion is caused

      if(!$this->connected()) {
	 $this->error = array(
	    "error" => "Called SendAndMail() without being connected");
	 return false;
      }

      fputs($this->smtp_conn,"SAML FROM:" . $from . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
      }

      if($code != 250) {
	 $this->error =
	    array("error" => "SAML not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }
      return true;
   }

   /**
    * Starts a mail transaction from the email address specified in
    * $from. Returns true if successful or false otherwise. If True
    * the mail transaction is started and then one or more Recipient
    * commands may be called followed by a Data command. This command
    * will send the message to the users terminal if they are logged
    * in or mail it to them if they are not.
    *
    * Implements rfc 821: SOML <SP> FROM:<reverse-path> <CRLF>
    *
    * SMTP CODE SUCCESS: 250
    * SMTP CODE SUCCESS: 552,451,452
    * SMTP CODE SUCCESS: 500,501,502,421
    * @access public
    * @return bool
    */
   function SendOrMail($from) {
      $this->error = null; # so no confusion is caused

      if(!$this->connected()) {
	 $this->error = array(
	    "error" => "Called SendOrMail() without being connected");
	 return false;
      }

      fputs($this->smtp_conn,"SOML FROM:" . $from . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
      }

      if($code != 250) {
	 $this->error =
	    array("error" => "SOML not accepted from server",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }
      return true;
   }

   /**
    * This is an optional command for SMTP that this class does not
    * support. This method is here to make the RFC821 Definition
    * complete for this class and __may__ be implimented in the future
    *
    * Implements from rfc 821: TURN <CRLF>
    *
    * SMTP CODE SUCCESS: 250
    * SMTP CODE FAILURE: 502
    * SMTP CODE ERROR  : 500, 503
    * @access public
    * @return bool
    */
   function Turn() {
      $this->error = array("error" => "This method, TURN, of the SMTP ".
	 "is not implemented");
      if($this->do_debug >= 1) {
	 echo "SMTP -> NOTICE: " . $this->error["error"] . $this->CRLF;
      }
      return false;
   }

   /**
    * Verifies that the name is recognized by the server.
    * Returns false if the name could not be verified otherwise
    * the response from the server is returned.
    *
    * Implements rfc 821: VRFY <SP> <string> <CRLF>
    *
    * SMTP CODE SUCCESS: 250,251
    * SMTP CODE FAILURE: 550,551,553
    * SMTP CODE ERROR  : 500,501,502,421
    * @access public
    * @return int
    */
   function Verify($name) {
      $this->error = null; # so no confusion is caused

      if(!$this->connected()) {
	 $this->error = array(
	    "error" => "Called Verify() without being connected");
	 return false;
      }

      fputs($this->smtp_conn,"VRFY " . $name . $this->CRLF);

      $rply = $this->get_lines();
      $code = substr($rply,0,3);

      if($this->do_debug >= 2) {
	 echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
      }

      if($code != 250 && $code != 251) {
	 $this->error =
	    array("error" => "VRFY failed on name '$name'",
	       "smtp_code" => $code,
	       "smtp_msg" => substr($rply,4));
	 if($this->do_debug >= 1) {
	    echo "SMTP -> ERROR: " . $this->error["error"] .
	       ": " . $rply . $this->CRLF;
	 }
	 return false;
      }
      return $rply;
   }

   /*******************************************************************
    *                       INTERNAL FUNCTIONS                       *
    ******************************************************************/

   /**
    * Read in as many lines as possible
    * either before eof or socket timeout occurs on the operation.
    * With SMTP we can tell if we have more lines to read if the
    * 4th character is '-' symbol. If it is a space then we don't
    * need to read anything else.
    * @access private
    * @return string
    */
   function get_lines() {
      $data = "";
      while($str = fgets($this->smtp_conn,515)) {
	 if($this->do_debug >= 4) {
	    echo "SMTP -> get_lines(): \$data was \"$data\"" .
	       $this->CRLF;
	    echo "SMTP -> get_lines(): \$str is \"$str\"" .
	       $this->CRLF;
	 }
	 $data .= $str;
	 if($this->do_debug >= 4) {
	    echo "SMTP -> get_lines(): \$data is \"$data\"" . $this->CRLF;
	 }
	 # if the 4th character is a space then we are done reading
	 # so just break the loop
	 if(substr($str,3,1) == " ") { break; }
      }
      return $data;
   }

}


?>
